The ANF300 RCCB is applying to the circuit breaker of AC/50/60Hz,220-250VAC single phase,415v three-phase and below it for industrial and mining enterprice,commerical building,and family,etc.To mainly prevent electric life and personal casualty accident caused by personal electric shock or leakage of electrified wiring.The RCCB is a currented-operated,fast leakage protector of electromagnetic type,which can break off fault circuit rapidly in order to avoid occurent of accident.